CVE-2006-1990 - wordwrap integer overflow
An integer overflow issue was discovered in PHP. This issue could
potentially lead to arbitrary code execution as it allows overwriting
an arbitrary section of memory with user supplied data. The
exploitability of this issue will depend on how a user program is
written to accept and process data passed to the wordwrap function.
http://www.infigo.hr/en/in_focus/advisories/INFIGO-2006-04-02